Evolutionary relationships of the ancient fern lineage the adder's tongues (Ophioglossaceae) with description of Sahashia gen. nov

• DOI: 10.1111/cla.12408
• Publication Date: 2020-01-18T07:04:15Z
• Authors: Liang Zhang; Xue‐Ping Fan; Sahanat Petchsri; Lin Zhou; Rossarin Pollawatn; Xin Zhang; Xin‐Mao Zhou; Ngan Thi Lu; Ralf Knapp; Sahut Chantanaorr...; Ponpipat Limpanas...; Hang Sun; Xin‐Fen Gao; Li‐Bing Zhang
• Keywords: Sensu; Monophyly; Lineage (genetic); Subfamily

Abstract As an ancient lineage of ferns, Ophioglossaceae are evolutionarily among the most fascinating because they have highest chromosome count any known organism as well presence sporophores, subterranean gametophytes, eusporangiate sporangia without annuli, and endophytic fungi. Previous studies produced conflicting results, identifyingsome lineages with unresolved relationships, paid much attention to subfamily Botrychioideae. But other species‐rich subfamily, Ophioglossoideae, has remained largely understudied only up 12 accessions Ophioglossoideae been sampled. In this study, DNA sequences seven plastid markers 149 (75 in Ophioglossoideae) representing approximately 82 species (approximately 74% estimated diversity sensu J. Syst. Evol., 2016, 54, 563) family, two Marattiaceae Psilotaceae, used infer a phylogeny. Our major results include: (1) resolved monophyletic strong support, so all four subfamilies genera PPG I except Botrypus Ophioglossum ; (2) new genus Sahashia is segregated from that monophyly can be retained; (3) its current circumscription uncertain spite our large character sampling; (4) there substantial cryptic speciation Ophioderma detected by molecular morphological study; (5) recognition Holubiella advocated based on morphology sister relationship Sceptridium (6) novel between Botrychium JHS clade ( Japanobotrychium + )) discovered.